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#1
02-09-2006, 05:18 PM
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VHO Question
How may watts before it's called VHO? Garfs website he is calling 40W VHO. I always thought it was higher like 110W.
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Murray I reserve the right to hijack any thread I want to!! My carbon footprint is bigger than your carbon footprint !!!! 
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#2
02-09-2006, 05:45 PM
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VHO technically refers to the .. um .. I'm sure to get this wrong but I'm going to make a stab at it anyhow... the amperage pushed through the bulbs. NO lamps (whether 20W, 40W or whatever, depending on the length), use one amperage (plus whatever voltage to make it 20W or 40W), then HO uses an amperage higher than that, and then VHO uses an amperage even higher than that. 48" VHO lamps are 110W, 24" VHO's are 75W.
So anyhow, there's no such thing as a "40W VHO". More likely he means he's running 40W lamps overdriven using a 110W ballast. Which you can do (assuming an electronic ballast is used), you will get some increased lumen output of the fluorescent, at the cost of (presumably) shortened useful lamp life.
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-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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#3
02-09-2006, 06:23 PM
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Yes Tony again hit the answer right on the button . ITs 40W BULB ran on a VHO ballast like a icecap.660 or a 440 with a Normal bulb 40 that is .
mike
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180 starfire front, LPS, millipora Doesn't matter how much you have been reading until you take the plunge. You don't know as much as you think.
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#4
02-09-2006, 09:50 PM
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Thanks guys for clearing that up
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Murray I reserve the right to hijack any thread I want to!! My carbon footprint is bigger than your carbon footprint !!!!
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#5
02-09-2006, 10:30 PM
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reply
Sorry to hijack, has anyone ever heard of overdriving T-5's the same way?
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THE BARQUARIUM: 55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's. Fully stocked with fish, corals and usually some fine scotch http://www.canreef.com/vbulletin/showthread.php?t=55041
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#6
02-09-2006, 10:36 PM
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Danny I'm doing it with the t-5 on m 660 icecap. If you go to the members tanks my 170 is lite by 2x 48" t-5"s 12K go take a look.
its very bright
__________________
180 starfire front, LPS, millipora Doesn't matter how much you have been reading until you take the plunge. You don't know as much as you think.
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#7
02-09-2006, 10:37 PM
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I don't see why it couldn't be done. I was going to try running 2 T5's on my WH7 which pumps out 220W so at 54W each for the HO T5's that would be basically exactly 2x overdriven.
But, I haven't gotten around to buying the lamps, endcaps and reflectors just yet.
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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#8
02-10-2006, 12:23 AM
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VHO= Very High Output
HO= High Output NO= Normal Output As you go up the chain, more amps are pushed through each tube. Typically bulbs are rated for NO, HO, or VHO. You can overdrive the bulb by using a different ballast to push more amps through. For a standard 48" bulb VHO=very high output 115watts HO=high output 60watts NO=normal 40watts So if you hook up a 48" HO ballast to a 48" NO bulb, you are driving it 1.5X 48" VHO to 48" NO bulb 2.875 times. Of course the possibilities are endless, but as you overdrive, things run hotter, and don't last as long.
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